See demo on Codepen: https://codepen.io/comehope/pen/VdOKQG
Watch interactive video on Scrimba: https://scrimba.com/p/pEgDAM/c43ekUL
Read annotated source on Segmentfault(zh-cn): https://segmentfault.com/a/1190000015484852
Inspired by: Mogeli lortkipanidze https://codepen.io/Hastalavistababy/pen/NyVzdx